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. 2019 Sep 2;19:167. doi: 10.1186/s12890-019-0932-5

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Kaplan-Meier analysis for the onset of acute exacerbation of ILD according to the 3-groups of ILD patients. *Significant difference between No-PH and PH: p = 0.023. **Significant difference between No-PH and Bo-PH: p < 0.001. Definition of abbreviations: ILD, interstitial lung disease; PH, pulmonary hypertension